Partial discharge and dissipation factor behavior of model insulating systems for high voltage rotating machines under different stresses

This article describes the change in partial discharge (PD) pattern of high voltage rotating machines and the change in the tan /spl delta/ as a function of the applied test voltage during the aging processes as caused by the application of different stresses on stator bars. It also compares the PD...

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Bibliographic Details
Published in:IEEE electrical insulation magazine 2005-09, Vol.21 (5), p.5-19
Main Authors: Farahani, M., Borsi, H., Gockenbach, E., Kaufhold, M.
Format: Magazinearticle
Language:English
Subjects:
Aging
Bars
Electrical insulation
High voltages
Insulation
Laboratories
Mathematical models
Partial discharges
Rotating machines
Stator bars
Stators
Stress
Stresses
Temperature
Testing
Voltage
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Summary:This article describes the change in partial discharge (PD) pattern of high voltage rotating machines and the change in the tan /spl delta/ as a function of the applied test voltage during the aging processes as caused by the application of different stresses on stator bars. It also compares the PD patterns associated with internal, slot, and end-winding discharges, which were produced in well-controlled laboratory conditions. In addition, the influence of different temperature conditions on the partial discharge activities are shown. The investigations in this work were performed on model stator bars under laboratory conditions, and the results might be different from those obtained for complete machines, as rotating machines are complex PD test objects, and for example, the detected PD signals in a complete machine significantly depend on the transmission path from the PD source to the measurement device.
ISSN:0883-7554
1558-4402
DOI:10.1109/MEI.2005.1513425